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module then queries the program selected now on the optical reader and outputs it via
the "CODE_OUT" parameter.
If the program now selected matches the program specified at the "PARAM1" parameter,
the "ACTIVE" parameter has the value "FALSE" and the "DONE" parameter the value
"TRUE". If the program now selected does not match the program specified at the
"PARAM1" parameter, the "ACTIVE" parameter has the value "FALSE" and the "ERROR"
parameter the value "TRUE". The "ERRCODE" parameter contains an appropriate error
message. The system also checks whether the program change is being blocked by a
"Service" or "User1" user logged on in the WBM who has taken control of the optical
reader, and whether the newly selected program has been saved.
If an error is detected, the "ACTIVE" parameter has the value "FALSE" and the "ERROR"
parameter has the value "TRUE". The "ERRCODE" parameter contains an appropriate
error message.
3. Call FB 79 again cyclically with "COMMAND=W#16#0081".
If you attempt to cancel a current change program job, the "ERRCODE" parameter will
change to "DW#16#00000002"; however, processing for the job will be completed.
Note
Notes on the program change
Note the following points when changing programs:
• When there is a program change, the optical reader changes to "STOP" for at least
150 ms. In isolated cases, a program change can take up to 15 s.
• If you specify the value "0" in the "PARAM1" parameter, the previously selected program
will be retained.
• The value of "PARAM1" must not be changed before the job is completed.
Sequence when saving a program ("COMMAND" = W#16#0002)
In order for the FB to initiate saving of a code, the "Control" parameter must have the value
"PROFINET IO" in the "Settings > Communication > Use > Connection" menu of the WBM.
The job can only be sent when the optical reader does not have the "ERROR" state (see
also the operating state table following the parameter table).
When the job is triggered, the parameters "DONE" and "ERROR" have the value "FALSE".
The "ACTIVE" parameter has the value "TRUE". The block saves the program specified at
the "PARAM1" parameter.
Note
Notes on saving
Note the following points when saving:
• In isolated cases, saving a program can take up to 35 s.
• The value of "PARAM1" must not be changed before the job is completed.
SIMATIC MV500
Operating Instructions, 05/2019, C79000-G8976-C494-02
Process interfacing via an automation system (PLC, PC)
9.4 Control with FB 79
147
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